Abstract
Modeling of the mechanical behavior of fiber-reinforced ceramic matrix composites (CMC) is presented by the example of Al2O3 fibers in an alumina based matrix. The starting point of the modeling is a substructure (elementary cell) which includes on a micromechanical scale the statistical properties of the fiber, matrix and fiber-matrix interface and their interactions. The numerical evaluation of the model is accomplished by means of the finite element method. The numerical results of calculating the elastic modulus of the composite dependance on the quantity of the fibers added and porosity was compared to experimental values of specimens having the same composition.
Highlights
Alumina silicate refractories are used in metallurgical, ceramic and glass industries
The geometry of the elementary cell was obtained by calculation using elements obtained from image analysis applied to the scanning electron microscope (SEM) images of the material and some calculations based on the composition of the material
The fiber dimensions were obtained from measurements of short fibers using the image analysis program
Summary
Alumina silicate refractories are used in metallurgical, ceramic and glass industries. These materials are made from refractory clays. Chamotte transforms refractories into high temperature compounds which have a heterogeneous microstructure with a large grain size distribution and high porosity. The use of fiber reinforced composites has been expanded in the world because of high strength, stiffness, ductility and impact resistance. The main goal of fiber addition is to improve the mechanical properties, mainly strength. [1] Composite materials are superior to all other known structural materials in specific strength and stiffness, high temperature strength, fatigue strength and other properties. The desired combination of properties can be tailored in advance and realized in the manufacture of a particular material
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